Hi Bryan,
If the Web Install doesn't work, try the Offline installer instead. It takes longer to download, but should include all the necessary files, and it won't have to try and download them.
Also, note that the "Registering Plug-in" part of the install can take a while, I've personally seen it last for several minutes. Sometimes it seems like it's hung up when it really isn't, so maybe you could try waiting a few minutes longer, and see if it eventually goes through.
Regards,
Raphaël Lalonde Lefebvre